{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T02:03:46Z","timestamp":1790474626403,"version":"4.1.0"},"reference-count":33,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2017,7,23]],"date-time":"2017-07-23T00:00:00Z","timestamp":1500768000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clinical Oral Implants Res"],"published-print":{"date-parts":[[2018,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To compare the alveolar bone dimensions in patients with lower second premolar (P2) agenesis prior to and after primary molar loss on <jats:styled-content style=\"fixed-case\">CT<\/jats:styled-content> scans, and assess the possibility for straightforward implant placement.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Alveolar bone dimensions were evaluated on 150 mandibular <jats:styled-content style=\"fixed-case\">CT<\/jats:styled-content> scans in three groups: (i) agenesis of P2, with the primary tooth in situ, and regularly erupted first premolar (P1) and molar (M1) (<jats:styled-content style=\"fixed-case\">AW<\/jats:styled-content>); (ii) agenesis of P2, without the primary tooth in situ for \u22653\u00a0m, but regularly erupted P1 and M1 (<jats:styled-content style=\"fixed-case\">AWO<\/jats:styled-content>); and (iii) P1, P2, and M1 regularly erupted (<jats:styled-content style=\"fixed-case\">CTR<\/jats:styled-content>). The possibility of straightforward placement of an implant 3.5 or 4.3\u00a0mm in \u00d8\u00a0\u00d7\u00a010\u00a0mm long was digitally simulated and compared to the actually performed treatment.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Buccolingual width (7.3\u00a0\u00b1\u00a02.0\u00a0mm) at the coronal aspect of the ridge in the <jats:styled-content style=\"fixed-case\">AWO<\/jats:styled-content> group was statistically significantly smaller comparing with both the <jats:styled-content style=\"fixed-case\">AW<\/jats:styled-content> (9.2\u00a0\u00b1\u00a01.4\u00a0mm) and the <jats:styled-content style=\"fixed-case\">CTR<\/jats:styled-content> (9.5\u00a0\u00b1\u00a01.1\u00a0mm) group; width reduction appeared to be mainly due to \u201ccollapse\u201d of the buccal aspect of the ridge. Simulated straightforward placement of implants with a diameter of 3.5 or 4.3\u00a0mm was possible in 62% and 56% of the cases in the <jats:styled-content style=\"fixed-case\">AWO<\/jats:styled-content> vs. 86% and 84% in the <jats:styled-content style=\"fixed-case\">AW<\/jats:styled-content> group (<jats:italic>p\u00a0<\/jats:italic>=<jats:italic>\u00a0<\/jats:italic>.006 and .002, respectively). Straightforward implant placement was actually possible in all patients (22) in the <jats:styled-content style=\"fixed-case\">AW<\/jats:styled-content> group, while 28% (11 of 39) of the patients in the <jats:styled-content style=\"fixed-case\">AWO<\/jats:styled-content> group needed additional hard tissue augmentation.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Significant dimensional differences exist in the alveolar ridge, especially in the coronal part, at lower P2 agenesis sites missing the primary tooth for \u22653\u00a0m, when compared to P2 agenesis sites with the primary tooth in situ. It seems thus reasonable to advise that the primary second molar should be kept as long as possible, in order to facilitate straightforward implant installation and reduce the probability of additional bone augmentation procedures.<\/jats:p><\/jats:sec>","DOI":"10.1111\/clr.13033","type":"journal-article","created":{"date-parts":[[2017,7,24]],"date-time":"2017-07-24T04:42:45Z","timestamp":1500871365000},"page":"155-163","source":"Crossref","is-referenced-by-count":23,"title":["Alveolar bone resorption after primary tooth loss has a negative impact on straightforward implant installation in patients with agenesis of the lower second premolar"],"prefix":"10.1111","volume":"29","author":[{"given":"Kristina","family":"Bertl","sequence":"first","affiliation":[{"name":"Department of Periodontology Faculty of Odontology University of Malm\u00f6  Malm\u00f6 Sweden"},{"name":"Division of Oral Surgery School of Dentistry Medical University of Vienna  Vienna Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael H.","family":"Bertl","sequence":"additional","affiliation":[{"name":"Division of Orthodontics School of Dentistry Medical University of Vienna  Vienna Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick","family":"Heimel","sequence":"additional","affiliation":[{"name":"Karl Donath Laboratory for Hard Tissue and Biomaterial Research Division of Oral Surgery Medical University of Vienna  Vienna Austria"},{"name":"Austrian Cluster for Tissue Regeneration  Vienna Austria"},{"name":"Ludwig Boltzmann Institute for Clinical and Experimental Traumatology  Vienna Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria","family":"Burt","sequence":"additional","affiliation":[{"name":"Division of Oral Surgery School of Dentistry Medical University of Vienna  Vienna Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andr\u00e9","family":"Gahleitner","sequence":"additional","affiliation":[{"name":"Department of Diagnostic Radiology Division of Osteoradiology General Hospital Medical University of Vienna  Vienna Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8161-3754","authenticated-orcid":false,"given":"Andreas","family":"Stavropoulos","sequence":"additional","affiliation":[{"name":"Department of Periodontology Faculty of Odontology University of Malm\u00f6  Malm\u00f6 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian","family":"Ulm","sequence":"additional","affiliation":[{"name":"Division of Oral Surgery School of Dentistry Medical University of Vienna  Vienna Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2017,7,23]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2842.2007.01829.x"},{"key":"e_1_2_7_3_1","first-page":"145","article-title":"An orthopantomographic study of hypodontia, supernumeraries and other anomalies in school children between the ages of 8\u20139\u00a0years. 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